Multiple antennas on 3D ground plane

Question

Christopher Bridges 2017-8-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/353892-multiple-antennas-on-3d-ground-plane

评论： Christopher Bridges 2018-4-30

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Hi Matlab, Matlab'ers,

Is there a way to put monopole antennas on the same groundplane?

I essentially have a box with multiple antennas on it connected to the same structure but am meeting errors:

Code:

ant1 = monopole('Height',0.492,'GroundPlaneLength',0.1,'GroundPlaneWidth',0.1);
% figure; returnLoss(vhf,50e6:1e6:1e9,50);
ant2 = monopole('Height',0.162,'GroundPlaneLength',0.1,'GroundPlaneWidth',0.1,'TiltAxis','Y','Tilt',180);
% figure; returnLoss(uhf,50e6:1e6:1e9,50);
n = 1e-1;
ant3 = monopole('Height',n,'Width',0.02,'GroundPlaneLength',0.34,'GroundPlaneWidth',0.1,'TiltAxis','Y','Tilt',90);
% figure; returnLoss(boom,50e6:1e6:500e6,50);
c = conformalArray('Element',{ant1,ant2,ant3},...
    'ElementPosition',[ 0 0 0.17 ;
                        0 0 -0.17;
                        0.05 0 0],'Reference','origin');
figure(1); show(c);

Error:

Error using conformalArray/meshGenerator (line 224)
Intersection detected in specified geometry.
Error in em.MeshGeometry/updateMesh
Error in em.MeshGeometry/getMesh
Error in em.EmStructures/analyze
Error in em.EmStructures/pattern (line 143)
analyze(obj,frequency, parseobj.Results.ElementNumber,                  ...
Error in gp (line 19)
figure(2); pattern(c,70e6);

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Answer 1

Sudarshan Kolar 2017-8-28

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Hi Christopher,

The error is expected because 'conformalArray' is supposed to create an Antenna Array and not a custom antenna. When you are designing an array, the elements do not intersect.

Infact, if you remove the intersection of the antennas:

ant1 = monopole('Height',0.492,'GroundPlaneLength',0.1,'GroundPlaneWidth',0.1);
% figure; returnLoss(vhf,50e6:1e6:1e9,50);
ant2 = monopole('Height',0.162,'GroundPlaneLength',0.1,'GroundPlaneWidth',0.1,'TiltAxis','Y','Tilt',180);
% figure; returnLoss(uhf,50e6:1e6:1e9,50);
n = 1e-1;
ant3 = monopole('Height',n,'Width',0.02,'GroundPlaneLength',0.34,'GroundPlaneWidth',0.1,'TiltAxis','Y','Tilt',90);
% figure; returnLoss(boom,50e6:1e6:500e6,50);
c = conformalArray('Element',{ant1,ant2,ant3},...
'ElementPosition',[ 0 0 0.18 ;
0 0 -0.18;
0.05 0 0],'Reference','origin');
figure(1); show(c);
figure(2); pattern(c,70e6);

Everything works perfectly fine.

Since you want to design custom antenna (and not array) please refer the following documentation and hopefully this should help you get started:

https://www.mathworks.com/help/antenna/ref/customantennageometry-object.html?searchHighlight=customAntennaGeometry&s_tid=doc_srchtitle

-Sudarshan

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Christopher Bridges 2017-8-29

编辑：Christopher Bridges 2017-8-29

在 MATLAB Online 中打开

Thanks Sudarshan - but I've already seen these. I'm studying how these antennas interfere with each other - use 2016a, and trials of the toolbox. Not sure I have everything to complete this - could be my problem:

ca = customAntennaGeometry
Undefined function or variable 'customAntennaGeometry'.

While I have you - how would I add differing materials? E.g. some basics like copper, aluminium, and carbon fibre?

And lastly, if I use one of these examples which one goes into 3D structures with multiple feeds? Vaguely close will do!

Thanks! C

Christopher Bridges 2018-4-30

Is there a response to this on creating a system with multiple antennas on the same ground plane? Still waiting but now have 2018 versions of the toolboxes!

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